From 7504cf835fffe78681ed0d29726dba4b18bbe169 Mon Sep 17 00:00:00 2001
From: Chun-Chieh Li <ccli8@nuvoton.com>
Date: Thu, 29 Aug 2019 18:08:12 +0800
Subject: [PATCH] M263: Fix mbedmicro-rtos-mbed-systimer/Wake up from deep
 sleep failing

This test requires total latency (tot = h/w + s/w) (wakeup from deepsleep) be
under 1ms. To check the issue, measure total latency on Nuvoton targets:

TARGET      EXP(us)     EXP+TOL(us) ACT(us)
NANO130     42000       43000       42939
NUC472      42000       43000       42236
M453        42000       43000       43274
M487        42000       43000       42877
M2351       42000       43000       43213

Checking h/w spec, h/w latency (wakeup time from normal power-down mode) on
M487/M2351 is just 1us (n/a on other targets). S/W latency plays the major
part here.

S/W latency relies on system performance. On Nuvoton targets, 'LPTICKER_DELAY_TICKS'
possibly complicates the test. Anyway, to pass the test, add extra 1ms latency
(deep-sleep-latency) in targets.json for Nuvoton targets.
---
 targets/targets.json | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/targets/targets.json b/targets/targets.json
index 61a3735217..73142d7c00 100644
--- a/targets/targets.json
+++ b/targets/targets.json
@@ -9093,7 +9093,10 @@
         "release_versions": ["5"],
         "device_name": "M263KIAAE",
         "bootloader_supported": true,
-        "tickless-from-us-ticker": true,
+        "overrides": {
+            "deep-sleep-latency": 1,
+            "tickless-from-us-ticker": true
+        },
         "forced_reset_timeout": 3
     },    
     "__build_tools_metadata__": {